<html>
<head>
  <script src="../OLLoader.js"></script>
  <script type="text/javascript">
    function test_Handler_MouseWheel_constructor(t) {
        t.plan(3);
        var control = new OpenLayers.Control();
        control.id = Math.random();
        var callbacks = {foo: "bar"};
        var options = {bar: "foo"};
        
        var oldInit = OpenLayers.Handler.prototype.initialize;
        
        OpenLayers.Handler.prototype.initialize = function(con, call, opt) {
            t.eq(con.id, control.id,
                 "constructor calls parent with the correct control");
            t.eq(call, callbacks,
                 "constructor calls parent with the correct callbacks");
            t.eq(opt, options,
                 "constructor calls parent with the correct options");
        }
        var handler = new OpenLayers.Handler.MouseWheel(control, callbacks, options);

        OpenLayers.Handler.prototype.initialize = oldInit;
    }

    function test_Handler_MouseWheel_activate(t) {
        t.plan(2);
        var map = new OpenLayers.Map('map');
        var control = new OpenLayers.Control();
        map.addControl(control);
        var handler = new OpenLayers.Handler.MouseWheel(control);
        handler.active = true;
        var activated = handler.activate();
        t.ok(!activated,
             "activate returns false if the handler was already active");
        handler.active = false;
        activated = handler.activate();
        t.ok(activated,
             "activate returns true if the handler was not already active");
    }
    
    function test_Handler_MouseWheel_mousePosition(t) {
        t.plan(1);
        var map = new OpenLayers.Map('map');
        map.addLayer(new OpenLayers.Layer.WMS("","",{}));
        map.zoomToMaxExtent();
        var control = new OpenLayers.Control();
        map.addControl(control);
        var pass = false;
        var handler = new OpenLayers.Handler.MouseWheel(control, {'up': 
          function (evt) { 
                if (evt.xy) { pass = true; }
          }
        });
        handler.setMap(map);
        handler.activate();
        var delta = 120;
        handler.onWheelEvent({'target':map.layers[0].div, wheelDelta: delta});
        t.ok(pass, "evt.xy was set even without a mouse move");
    }    
    
    function test_Handler_MouseWheel_events(t) {
        t.plan(6);
        
        var map = new OpenLayers.Map('map');
        map.addLayer(new OpenLayers.Layer.WMS("","",{}));
        map.zoomToMaxExtent();
        var control = new OpenLayers.Control();
        map.addControl(control);
        var deltaZ;
        var handler = new OpenLayers.Handler.MouseWheel(control, {
            'up': function(evt, delta){
                deltaZ = delta;
            }
        }, {interval: 200});

        // list below events that should be handled (events) and those
        // that should not be handled (nonevents) by the handler
        var events = ["mousemove"];
        var nonevents = ["dblclick", "resize", "focus", "blur"];
        map.events.registerPriority = function(type, obj, func) {
            var r = func();
            if(typeof r == "string") {
                t.eq(OpenLayers.Util.indexOf(nonevents, type), -1,
                     "registered method is not one of the events " +
                     "that should not be handled");
                t.ok(OpenLayers.Util.indexOf(events, type) > -1,
                     "activate calls registerPriority with browser event: " + type);
                t.eq(typeof func, "function",
                     "activate calls registerPriority with a function");
                t.eq(func(), type,
                     "activate calls registerPriority with the correct method");
                t.eq(obj["CLASS_NAME"], "OpenLayers.Handler.MouseWheel",
                     "activate calls registerPriority with the handler");
            }
        }
        
        // set browser event like properties on the handler
        for(var i=0; i<events.length; ++i) {
            setMethod(events[i]);
        }
        function setMethod(key) {
            handler[key] = function() {return key};
        }

        var activated = handler.activate();
        
        var delta = 120;
        handler.onWheelEvent({'target':map.layers[0].div, wheelDelta: delta});
        handler.onWheelEvent({'target':map.layers[0].div, wheelDelta: delta});
        t.delay_call(1, function() {
            t.eq(deltaZ, 2, "Multiple scroll actions triggered one event when interval is set");
        });
    }

    function test_Handler_MouseWheel_cumulative(t) {
        t.plan(2);

        var deltaUp = 0, ticks = 0;
        var callbacks = {
            up: function(evt, delta) {
                deltaUp += delta;
                ticks++;
            }
        };

        var map = new OpenLayers.Map('map');
        map.addLayer(new OpenLayers.Layer.WMS("","",{}));
        map.zoomToMaxExtent();
        var control = new OpenLayers.Control({});
        map.addControl(control);
        var handler = new OpenLayers.Handler.MouseWheel(control, callbacks, {
            interval: 150,
            cumulative: false,
            maxDelta: 6
        });

        var delta = 120;
        // generate 20 scroll up in non cumulative mode
        for (var i=0; i < 20; i++) {
            handler.onWheelEvent({'target':map.layers[0].div, wheelDelta: delta});
        }
        
        t.delay_call(2, function() {
            t.eq(deltaUp / ticks, 1, "Cumulative mode works");
            t.eq(ticks, 4, "up called 4x with maxDelta of 6");
        });
    }

    function test_Handler_MouseWheel_deactivate(t) {
        t.plan(2);
        var map = new OpenLayers.Map('map');
        var control = new OpenLayers.Control();
        map.addControl(control);
        var handler = new OpenLayers.Handler.MouseWheel(control);
        handler.active = false;
        var deactivated = handler.deactivate();
        t.ok(!deactivated,
             "deactivate returns false if the handler was not already active");
        handler.active = true;
        deactivated = handler.deactivate();
        t.ok(deactivated,
             "deactivate returns true if the handler was active already");
    }
    function test_handler_MouseWheel_destroy(t) {
        t.plan(1);
        var control = new OpenLayers.Control();
        var handler = new OpenLayers.Handler.MouseWheel(control);
        handler.deactivate = function() { 
            t.ok(true, "Deactivate called one time.");
        }    
        handler.destroy();
    }


  </script>
</head>
<body>
    <div id="map" style="width: 300px; height: 150px;"/>
</body>
</html>
